微生物抑制<strong>5754</strong>铝合金的海水腐蚀行为

doi:10.11900/0412.1961.2020.00129

金属学报

2020, Vol. 56

Issue (12): 1681-1689 DOI: 10.11900/0412.1961.2020.00129

本期目录 | 过刊浏览

微生物抑制5754铝合金的海水腐蚀行为

申媛媛, 董耀华(

), 董丽华, 尹衍升

上海海事大学海洋科学与工程学院上海 201306

Corrosion Inhibition Effect of Microorganism on 5754 Al Alloy in Seawater

SHEN Yuanyuan, DONG Yaohua(

), DONG Lihua, YIN Yansheng

College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China

引用本文:

申媛媛, 董耀华, 董丽华, 尹衍升. 微生物抑制5754铝合金的海水腐蚀行为[J]. 金属学报, 2020, 56(12): 1681-1689.
Yuanyuan SHEN, Yaohua DONG, Lihua DONG, Yansheng YIN. Corrosion Inhibition Effect of Microorganism on 5754 Al Alloy in Seawater[J]. Acta Metall Sin, 2020, 56(12): 1681-1689.

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摘要:

采用失重法分析5754铝合金在含海洋常见微生物枯草芽孢杆菌(B.subtilis)的海水中的腐蚀行为，利用SEM和白光干涉仪分别观察了表面腐蚀产物形貌及腐蚀轮廓，并用EDS和XRD分析了表面腐蚀产物成分，最后利用EIS研究该铝合金的腐蚀机理。结果表明，浸泡在含有微生物B.subtilis的海水环境中，铝合金腐蚀速率为12.5 mg/(dm²·d)，仅为浸泡在不含有微生物海水环境中铝合金腐蚀速率的1/6。浸泡在含有B.subtilis的海水环境中，铝合金表面逐渐形成一层以CaMg(CO₃)₂为主要成分的矿化物质膜，微生物B.subtilis的存在促进了生物矿化膜的形成，阻碍了海水对铝合金的侵蚀，从而抑制了铝合金在海水环境中的点蚀。

关键词 ： 5754铝合金, 微生物, 抑制海水腐蚀, 生物矿化膜

Abstract：

Currently, with the gradual depletion of onshore resources, more efforts are being devoted to both scientific and resource exploitation of the ocean and the deep sea. Compared with the onshore environment, marine habitats are complex and characterized by high hydrostatic pressure, high salinity, and high marine population. The ocean is a unique aquatic environment, and it has a large population of microorganisms. There is a need to exploit the ocean for new energy sources. The significant challenges of exploiting oil, gas, and minerals have forced the people to innovate and develop advanced exploration tools. Al alloys are attractive for use in marine environments due to their low densities, high strengths, good plasticity, excellent electrical and thermal conductivities, and excellent corrosion resistance. The high chloride concentrations and microorganisms in the ocean have a significant effect on the corrosion resistance of many metallic materials. In this work, the corrosion behavior of 5754 Al alloy in seawater containing B.subtilis was investigated. The corrosion rate was analyzed by the weight loss method. The morphologies of the corrosion products and the corrosion profiles were observed by SEM and white light interferometer, respectively. The corrosion products were analyzed by energy dispersive spectroscopy and XRD. Finally, the corrosion mechanism of the Al alloy was studied using electrochemical impedance spectroscopy. The results show that the corrosion rate of the Al alloy in the seawater with B.subtilis was 12.5 mg/(dm²·d), which was only 1/6 times that in the seawater without the bacteria. A protective film comprising of CaMg(CO₃)₂ was gradually formed on the surface of the alloy in the presence of the bacteria. The bacteria promoted the formation of the CaMg(CO₃)₂ film, which protected the alloy from the seawater, and consequently, inhibited the pitting corrosion of the Al alloy in the marine environment.

Key words： 5754 Al alloy microorganism inhibition marine corrosion biomineralized film

收稿日期: 2020-04-22

ZTFLH:

TG174.3

基金资助:国家自然科学基金项目(51609133)

作者简介: 申媛媛，女，1989年生，博士，工程师

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00129 或 https://www.ams.org.cn/CN/Y2020/V56/I12/1681

图1 5754铝合金在不同溶液中浸泡前后的表面形貌及成分分析(a) original morphology of 5754 Al alloy(b) immersed in sterilized seawater for 15 d(c) immersed in seawater with bacteria for 15 d(d) partial magnification of the film in Fig.1c (Inset shows the morphology of bacteria)(e) EDS result of zone 1 in Fig.1b(f) EDS result of zone 2 in Fig.1c

图2 5754铝合金在2种溶液中浸泡15 d后表面的XRD谱

图3 5754铝合金浸泡前后的表面腐蚀轮廓图Color online

图4 5754铝合金在不含微生物B.subtilis的海水中浸泡不同时间的EIS(a) Nyquist plots(b) Bode impedance plots(c) Bode angle plots

图5 5754铝合金在含微生物B.subtilis的海水中浸泡不同时间的EIS(a) Nyquist plots(b) Bode impedance plots(c) Bode angle plots

图6 5754铝合金在2种溶液中浸泡不同时间的等效电路图

表1 5754铝合金在不含微生物的海水中浸泡不同时间的电化学拟合参数

表2 5754铝合金在含微生物的海水中浸泡不同时间的电化学拟合参数

图7 5754铝合金在2种溶液中浸泡不同时间的膜层电阻与电荷转移电阻之和随时间的变化

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